diff --git a/src/shared/store/pinnedFlowchart.ts b/src/shared/store/pinnedFlowchart.ts
new file mode 100644
index 0000000..aa32086
--- /dev/null
+++ b/src/shared/store/pinnedFlowchart.ts
@@ -0,0 +1,18 @@
+import { defineStore } from "pinia"
+
+export const usePinnedFlowchartStore = defineStore("pinnedFlowchart", () => {
+  const isPinned = ref(false)
+  const mermaidCode = ref("")
+
+  function pin(code: string) {
+    mermaidCode.value = code
+    isPinned.value = true
+  }
+
+  function unpin() {
+    isPinned.value = false
+    mermaidCode.value = ""
+  }
+
+  return { isPinned, mermaidCode, pin, unpin }
+})